Fire-box for boilers.



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APPLICATN LED ULY 20.191'- 1,320,236. Patented Oct. 28, 1919,

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FIRE BOX. FUR BOILERS. Armcmou mso :uw zo. m1.

Patented Ovt. 28, 1919.

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ROBERT JOY, 0F OSWEGO, NEW YORK.

FIRE-BOX FOR BOILERS.

Specification of Letters Patent.

Patented Oct. 28. 1919.

\ Application tiled July 20, 1917i Serial No. $1,847.

To all whom it may concer-n.'

Be it known that LRoa'r JOY, a citizen of the. United States, and resident of Oswego, county of Oswego, and State of New York, have invented certain new and useful Improvements in and Relatin to Fire-Boxes for Boilers, of which the fol owing is a Specification.

This invention relates to certain improvements in fire boxes for boilers of the locomotive type; and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanation of the accompanying drawings illustrating WhatI now believe to he the. preferred mechanical expression or embodiment of my invention from among other forms, constructions and arrangements within the spirit and scope thereof.

It is an object of my invention to provide an improved boiler fire box having front and rear water legs and side walls composed of water tubes, Vherein the tubes are similar. whereby certain economies and advantages are attained.

A further object of in v invention is to provide a boiler fire box having side walls comprising Water tubes at their upper ends connected with top drums and at their lower ends connected with a mud ring or sill, wherein the water tubes are formed with reduced ends whereby the tubes of a row of closely arranged tubesl can be connected with a drum along'a straight line and can also be connected to a boiler-plate nuul ring along a straight line.

further object of the invention is to provide a` boiler fire box having end water legs. a mud ring. top drums. and side water tubes. wherein the various partsl can be composed of boiler plates and tubes.

further object of the invention is to provide a boiler fire box having its side walls formed b v rows of water tubes. with a pair of horizontal longitudinal top drums into which the upper ends of said rows of tubes are connected. so arranged as to maintain the. u'ater in the boiler at approximately the desired level and at the same time pio vidithe desired water and steam capacity in said drums.

A further objectof the in ventiou is to provide a boiler tire box having a mud ring. Side walls comprising rou-s of vertical water tubes connected into said ring and longitudinal top drums into which the upper ends of said tubes are connected. with cross water tubes between said drums for equalizing conditions in the drums and also for the purpose of aiding in closing the space between the drums against upward flow of burning gases and products of combustion.

A further object of thev invention is to provide improved means and arrangements for the protection of the Water tubes and 'for inclosing the tire box, in water tube lire boxes for boilers.

A further object of the invention is to simplify the construction of water leg and lwater tube fire boxes for boilers and render the same more economical in construction and maintenance.

A further object of the invention is to im- Yprove the construction, formation and arrangement of water tubes employed in water t-ube and uaterwleg fire boxes for boilers. with the end in view of cheapening the construction and rendering the same more durable than heretofore.

A further object of the invention is to improve the construction of water boxes employed in uater leg and wider tube tire boxes for'boilers with the end in view of rendering said tire boxes more durable and economical in construction.

lVith these and other objects in view, my

invention consists in certain novel features in construction and in combinations and arrangements as more fully and particularly set forth and speciied hereinafter.

Referring to the accompanying drawingsi- Figure 1. is a longitudinal vertical seetion (on the lim` 1 1. Fig. 2) of a fire box embodying m v presentfinvention. a portion of the. boiler beingshou'n.

Fig. 2. is a cross 'section on the line -2. Fin'. 1.

Fig. 3, is a icrtical detail section on the line 3 3. Fig. 2. i

Fig. 4. is a detail horizontal line -t-t. Fig. 1.

Fig. 5. is a detail horizontal section on the line 5-5, Fig. 1.

Fig. 6. is a detail (somewhat diagrammatical) perspective of the mud ring.

In the drawings. I show a portion of the waist or cylindrical shell 1, of a boiler of section on th(` the locomotive ty havin fire tubes 2. In the embodiment iiliistrate the tubes extend rearwardly beyond the vertical plane in which the rear end of shell 1 terminates, and are secured in or to the` tine sheet 3.

An inner or front throat sheet 4 is spaced forwardly from and approximately parallel with the sheet 3 and is formed with an o ienug receiving the' rear end of the she l 1. This sheet t is 'also formed with a forwardly extending fiange 5 apiroximately at right angles` to the vertical p ane of the sheet, and this Hange tits the exterior of the shell iand is continuous around the same and is rigidly riveted or otherwise united thereto.

The two sheets 3, 4, are suitably coupled together and depend fnoiii the boiler to forni a water leg erhaelt at the inner or front end'of the'fire.box. For instance, the sheet 3 .is formed with a forwardly extending approximately right angle flange?, and the sheet 4 with a corresponding rearwardly extending Han e 4*. The outer or surrounding'ed portions of the sheets are bent or p to form these flanges which are continuous around the sheets except at 'the boti thereof. The edge extremities of these anges ap roxiniately meet, and the flanges are unite in any suitable manner as by exterior strap pla-te '7 oierlying the fianges and bridging the joint bet-weenl the edges of the iiinges and united to this tianges by rows of rivets 7*, or by weldin if so preferred. The'fianges' thus -orin tie vertical edge walls of the water leg, 'and the portion of the boiler shell around the rear ends of thetubes alud extending rearwardly from shell 1. l If so desired, the lower portions pf the sheets 3, 4, forming the'water legi, can be stitened' and braced by connecting stay' bolts 8.

The sheet 8 forms'the inner end wall of the fire box, and the outer or firing end of, the rebox vis formed by a waterliead or leg comprising a pair of parallel vertical united flanged sheets. For instance, I show this front head comprising inner sheet o,

lrving its outer edge (except at the bottom ofthe sheet), forming rearwardly extending approximately right angle flan e 9, and

' outer sheet 10 havin its outer e ge (except 'at the bottom of t sheet) forming forwardly extending a proximately right angle Range 10". The e ges ofgthesc flanges up roxiinately meet and the flanges are united y exterior strap 11 riveted or otherwise united to the flanges. The sheetsare also formed with openings and surrounding oreglping. riveted fianges to provide one or l "fire door openings a.

If sodesii'ed, the two sheets 9, 10, can he Arigidly braced and stiftened at suitable points ,by stay bolts 11".

.The roof or top' of the fire box comprises,

in the exiibodinient illustrated, n pair of, horizontal parallel spaced similar longitudinal steam and water drums 12 at their inner ends opening into the lipilrr und at their outer ends opening into the outer water head oi' leg. h The lsheet 3 is formed with u pair of' spaced openings to receive the cylindrical inner ends of these drains and with rearwardly extending'approximately right anglil flanges 3 continuous around said openings and snugly fitting and lapping the cxteriors of thje drains, respectively, andrigidly united thereto in any suitable nianncrasl by riveting.

The sheet 9 of the outer water legis also forined with a pair of spaced transverse of approximately the saine diameter as the 1 'opei'iiiigsv in sheet-,19, and u ith nuirwardly projecting approxiniatel)` right angle cylindrical flanges 10", surrounding said openings, respectively. These Heiliges and openv ings receive dished heads 13 secured lo the Bungee' b i' rireting or in any other suitable manner, and in eti'ect, forming the closed exterior ends or heads of the drums.

The. two drunis ai'e'arranged in the saine horizontal plane and are spaced inwardly uniform distances from the outer vertical lines of the tire box and are spared apart a suitable distance. 'lhe'interior water Ispaces of the two drums are. placed in direct coniinunieatiou with each otlierap n'oxiinatrly throughout the length of thi` ii'uins by a series of cross tubes 14. opening into and secured to the drums. approximately the. lower portionsof the iutrrioi's of the li-unisI and are preferably unifornilil spared apart to serve to cquuli'ffe rouditions within the drums and maintain the desired water rrrulation witliiu the druius. These tubes also serve to support suitable refractory material blocks 15 closing thespace between the. drums against. upward flow of burning gases and products of coinbu stion.

. Each side wall of the tire box is formed by u series of upright closell arranged water tubes 1,6' at their upper ends openingr -into the cli-unis 12 adjareut that. side of the ibo These tubes ruiniert aube ing from the outer vrai/ep le orhead to the inner water leg or headv an are referably arranged so close together as to a most contact at their adjacent longitudinal surfaces. The opposite end portions of each tube are abruptly contracted to form' end necks 16, at the exteriors of the drum and mud box, and the outer extremities of these necks open into the drums and mud box through perforations or holes formed therein to receive the tubes and are united to the drums and box preferably by any suitable weldin process, although if so desired, I can wel the lower end necks of the tubes to the mud box and expand the upper end necks of the tubes in the' drums.

By thus formin the tubes with contracted end necks of t e required length, I can arrange the tubes with their bodies or major portions approximately contacting and can secure all of the tubes of a row in a straight line along the drum and mud box while using a minimum number of tubes. IThe bontractecl necks require such small holes in the drums and mud box that these 'holes can be arranged in a straight line without removing so much of the material of the drums along such lines as to seriously weaken the drums. In other words, it would dangerous to form a row of holes of the size required to receive the` full diameters of the tubes where the tubes are arranged as closely together as required to form the lire `box wall.

85E Both side walls of the lire box are formed by rows of similar tubes 16, the tubes are all approximately -similar and interchangeable Vand hence can be economically produced and assembled. Each tube `is. straight throughout the major portion of its-'length with its upper rtion slightly curved or deflected lateralllyo to enter the lower por? tion of the outer side of the adjacent drum 12` so that the upper portions of the fire box side walls, formed by these duplicate tubes, provide the outer arhed portions of the roof of the fire boi: between the drums and the general vertical outer side lines of the fire box.

Various means can be provided for complating and insulating the side walls of the lire box against escape of burning gases, etc., between the duplicate tubes and for reducing loss of heat -to a minimum. For instance, I show a suitably packed or insulated steel or other exterior metal easing 17 at the outer sides of the fire box and extended over the drums and includin wings or sheets 17* arranged over and fo lowing the curved u per ends of the tubes to the outer sides ci) the drums. Between the insulating material at the inner surfaces of casing sheets 17,-17, and the upright water tubes 16,1 preferably arrange blocks 18 of any suitable refractory or insulating ma- Vthe abrupt shoulders of the tubes.

terial usuallygcgpncaved at their iiiner faces to fit the tubes and close the spaces between the tubes. 4These blocks preferably form' walls at the outer sidesof each row of tubes' lfrom the outer water le to the inner water leg and'throughout t e vertical lengths the blocksof the inner series approximately A meet the blocks of the outer series along' each row of tubes and are securedtogether by cross bolts 20 to entirely inclose the necks oi the rows of tubes and iill in the spaces between the necks and from the mud box to These comparatively heavy metal blocks also serve to stiifen the structure and protect the ends ofthe tubes from the lire' tools.

The base of the fire box is formed by a mud ring or box which in the example illustrated is in the form of a rectangular open frame composed of.steel or other suitable metal boiler plates.

The cross or end members 21 of this box and inner water legs. These mem-bers 21 are composed of boiler plates pressed up to U or trough form. The lower edges of the sheets 10, 9, of the outer water leg depend at the outer surfaces of the sides of t-he outer member 21 and are riveted or otherwise secured thereto while the edge flanges 10. Si, of Said sheets lit the ends of said member and are Secured thereto so that th(` member forms a tight closure for the lower end of the water leg. The inner member 21 is secured to the sheets 4, after th(` same man ner to form the bottom closure for the inner water leg. The two opposite side or longzitudinal members 22 of thc mud box are in the vertical planes of lthe rows of water tubes 16, respectively.' and are closed at the top to form closed chambers, manifolds or communication ivith the interiors of .the water legs and to provide flanges 22 secured to members 2:2.

It will thus be noted that the water is fre'e to circulate tlu'ouglrthe ends and side members of the mud ring to and from the water legs and from the `muti ring through the upright tubesI and into and through the drums to and from the water legs and boiler shell.

The closed chamberfo-rming members 22 ot' the mud ring are. preferably composed of boiler plates pressed into trough form with each member formed by an upper trough placed in reversed position on a lower trough. the longitudinal edges of the two troughs being united b r welding'. The ends of the boiler plate end members 21 can be united to the ends ot' the closed hollow mem bers 22 in any suitable manner as by welding or li riveting together overlapping edges thereof..

I provide a fire box that is not only ex ceedingly simple and durable in construction and maintenance, but also one com'posed of parts that can be economically assembled and also that can be economicallyI produced largel) from stock material. The box is composed essentially of boiler plates and tubes and I employ regulation or right angle flanges wherever possible. I also attain ma` terial advantages by forming the fire box side wallsl of rows of duplicate tubes.

it is evident that various changes, variations and modifications might be resorted to without departing from the spirit and scope of my invention and hence I do not wish to limit myself to the exact disclosures hereof'.

'hat I claim is:

1. A boiler fire box having a water circlilating mud sill, top water circulating means. upright wat-er circulating tubes at their upper ends comnuinicating with said means, the lower ends of said tubes having contracted necks opening into said sill. and blocks on said sill and fitting and closing the spaces between said necks and protecting the necks against injury from within the fire box.

2. A boiler fire box having a Water circlilating mud sill, top water circulating means, upright water circulating tubes at their upper ends communicating with said means, the lower ends of said tubes having contracted necks opening into said sill. and in ner and outer rows of blocks fitting and protecting said necks and closing the spaces between the same.

i5. A boiler fire box comprising a watercirenlating mud sill` rows of closely-arhl ranged upright water circulating tubes along the outer sides of the fire box having contracted necks opening into said sill, means arranged along the inner sides ot' 65 said rows and protecting and closing the spaces between said necks.y and securing devices for said means.

4. A boiler fire box comprising a watereirculating mud sill. rows of closely-arranged upright water circulating tubes along the outer sides of the fire box having contracted necks opening into said sill. protecting means arranged along the inner and outer sides of said rowsfand embracing said necks and closing the spaces between the same, and securing (l vices for said means.

5. A boiler fire box comprising a mud sill;

.rows of upright water circulating tubes at the sides of the fire box and opening into said sills; water circulating means along the top of the fire box and receiving the upper ends of said tubesand embodying a top longitudinal drum; and an upright water box at the rear end of the fire box and consisting essentially of a front sheet having an opening alined with said drum and a for wardl)1 extending flange surrounding and fixed to the rear end of the drum and also having a rearwardly-extending edge flange, a rear sheet having ay .forwardly extending edge flange fixed to said edge flange of the front. sheet` said rear sheet having an opening alined with said drum and a orwardlyextending right angle flange around said opening; and an outwardly dished head closing said opening and fitting within and fixed to said flange around the same.

(i. A boiler of the locomotive type having a fire box and provided with a'depending 100 water leg and a rear end throat sheet at the front end of the fire box and forming the rear Wall of said leg, said tube sheet having transverse openings at the lower outer co1'- ners of the Water leg and exterior flanges adjacent to said openings; an apri ht wa.-

ter box at the rear end of the re box comprising a front sheet having transverse openings at the lower outer corners of the water box and exterior flanges adjacent t0 110 said openings; a mud sill having end cross portions secured to and forming the bottom closures of said leg and water box and tubular longitudinal portions fixed to sai'd cross portions and entering the water box and leg through said transverse openings and fixed to said flanges.` said longitudinal portions having ends opening directly intothe water box and leg transversely through said sheets thereof; and upright water circulating tubes at their lower ends opening into said tubular portions ot' said sill.

Signed,

` ROBERT JOY. 

